KSPGuessCreate

Creates a KSPGuess context.

Synopsis

#include "petscksp.h"  
PetscErrorCode KSPGuessCreate(MPI_Comm comm, KSPGuess *guess)

Collective

Input Parameter

• comm - MPI communicator

Output Parameter

• guess - location to put the KSPGuess context

Options Database Keys

• -ksp_guess_type - Turns on generation of initial guesses and sets the method; use -help for a list of available methods

• -ksp_guess_view - view the KSPGuess object

• -ksp_guess_fischer_model <a,b> - set details for the Fischer models

• -ksp_guess_fischer_monitor - monitor the fischer models

• -ksp_guess_fischer_tol - set the tolerance for the Fischer models

• -ksp_guess_pod_size - Number of snapshots

• -ksp_guess_pod_monitor true - monitor the pod initial guess processing

• -ksp_guess_pod_tol - Tolerance to retain eigenvectors

• -ksp_guess_pod_Ainner true - Use the operator as inner product (must be SPD)

Note

These are generally created automatically by using the option -ksp_guess_type type and controlled from the options database

There are two families of methods KSPGUESSFISCHER, developed by Paul Fischer and KSPGUESSPOD

See Also

KSP: Linear System Solvers, KSPSolve(), KSPGuessDestroy(), KSPGuess, KSPGuessType, KSP

Level

developer

Location

src/ksp/ksp/interface/iguess.c

Implementations

KSPGuessCreate_Fischer() in src/ksp/ksp/guess/impls/fischer/fischer.c
KSPGuessCreate_POD() in src/ksp/ksp/guess/impls/pod/pod.c

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Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages